Question

a car moving with uniform acceleration of 10m/s^2 on straight road changes its speed from 10m/s to 30m/s find time lapsed for change of speed
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Answer 1

Answer:

2 seconds

Explanation:

Given :

• Acceleration => 10m/s^2

• Initial velocity => 10m/s

• Final velocity => 30m/s

To Find :

• Time = ?

Solution :

We know that v = u + at

So,

t = (v-a)/a

Put their values and solve it :-

$\sf{t=(30-10)/10}s$

$\sf{t=(20)/10}s$

$\sf{\because time=2\ seconds}$

Therefore time lapsed are 2 seconds

Answer 2

$\large\bf{\underbrace{\purple{SOLUTION:-}}}$

GIVEN :-

• A car moving with uniform acceleration of ‘10 m/s²’ on straight road changes its speed from ‘10 m/s’ to ‘30 m/s’ .

▼ So, Here

• acceleration (a) = 10 m/s²

• initial velocity (u) = 10 m/s

• final velocity (v) = 30 m/s

FORMULA :-

$\bigstar\:\rm{\underline{\red{\boxed{v\:=\:u\:+\:at\:}}}}$

▼ where,

• v = final velocity
• u = initial velocity
• a = acceleration
• t = time

To Find :-

• Time required .

CALCULATION :-

$\rm{\implies\:30\:=\:10\:+\:10\times{t}\:}$

$\rm{\implies\:10\times{t}\:=\:30\:-\:10\:}$

$\rm{\implies\:t\:=\:\dfrac{20}{10}\:}$

$\rm{\blue{\boxed{\implies\:t\:=\:2\:second\:}}}$